With Spotify having recently released an update to now make all tracks of high quality and also "extreme" quality, how about adding an EQ into the app? I can't see the point in using my £300 Shure SE535 earphones with just the standard EQ settings when listening to Extreme sync'd or streamed tracks on my iPhone and I'm sure everybody else with a half decent pair of earphones/headphones will also agree!! I like to shape my music to how the earphones respond to whatever I'm listening to.